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Given a 3x3 grid of 'B' and 'W', determine whether flipping at most one cell can produce a 2x2 sub-square with all four cells the same color. Equivalently, check if any 2x2 block already has at least three cells of the same color.
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Leetcode 3127. Make a Square with the Same Color
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Source snapshot: Nov 12, 2026
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